.Biden readying to block Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel says it could possibly leave Pittsburgh if Nippon deal flops as Biden considers to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The Nyc TimesExclusive|United State Steel Portend Vegetation Closings if Purchase Collapses The Wall Street JournalBiden prepared to block out United States Steel investment through Nippon Steel CNN.